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            <h1 class="post-title">探索Flutter_Image显示Webp逻辑</h1>
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        <date class="post-meta meta-date">
            2021年9月5日
        </date>
        
        <div class="post-meta">
            <span>|</span>
            
            <span class="meta-category"><a href='/categories/flutter'>flutter</a></span>
            
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        <div class="post-meta">
            <span id="busuanzi_container_page_pv">|<span id="busuanzi_value_page_pv"></span><span>
                    阅读</span></span>
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        <div class="post-content">
            <blockquote>
<p>本文主要介绍探索Flutter_Image显示Webp逻辑</p>
</blockquote>
<h1 id="简介">简介</h1>
<p>最近探索了一下新增Flutter的Image widget对webp做一个stopAnimation的拓展的Api，顺便了解一下Image整个结构和对一些多帧图片的处理。 我们先看看Image的一个类图结构。</p>
<p>
        <a data-fancybox="gallery" href="https://luckly007.oss-cn-beijing.aliyuncs.com/img/image-20210905071500687.png">
            <img class="mx-auto" alt="image-20210905071500687" src="https://luckly007.oss-cn-beijing.aliyuncs.com/img/image-20210905071500687.png" />
        </a>
    </p>
<p>其中：</p>
<ul>
<li><strong>ImageProvider</strong> 提供加载图片的入口，不同的图片资源加载方式不一样，只要重写其load方法即可。同样，缓存图片的key值也有其生成。</li>
<li><strong>FileImage</strong> 负责读取文件图片的数据，读取到的文件数据转化成ui.Codec对象交给ImageStreamCompleter去处理解析。</li>
<li><strong>ImageStreamCompleter</strong>就是逐帧解析图片的类，生成之后会加入ImageCache，下载可以从缓存中得到。</li>
<li><strong>ImageStream</strong>是处理Image Resource的，ImageState通过ImageStream与ImageStreamCompleter建立联系。ImageStream里也存储着图片加载完毕的监听回调。</li>
<li><strong>MultiFrameImageStreamCompleter</strong>就是多帧图片解析器。 Flutter imgae支持的图片格式为：JPEG, PNG, GIF, Animated GIF, WebP, Animated WebP, BMP, and WBMP。Flutter Image是显示图片的一个Widget。 Flutter Image的几个构造方法：</li>
</ul>
<table>
<thead>
<tr>
<th style="text-align:left">方法</th>
<th style="text-align:left">释义</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">Image()</td>
<td style="text-align:left">从ImageProvider中获取图片，从本质上看，下面的几个方法都是他的具体实现。</td>
</tr>
<tr>
<td style="text-align:left">Image.asset(String name)</td>
<td style="text-align:left">从AssetBundler中获取图片</td>
</tr>
<tr>
<td style="text-align:left">Image.network(String src)</td>
<td style="text-align:left">显示网络图片</td>
</tr>
<tr>
<td style="text-align:left">Image.file(File file)</td>
<td style="text-align:left">从文件中获取图片</td>
</tr>
<tr>
<td style="text-align:left">Image.memory(Uint8List bytes)</td>
<td style="text-align:left">从Uint8List获取数据显示图片</td>
</tr>
</tbody>
</table>
<h1 id="image">Image</h1>
<p>从Image的构造体上看，ImageProvider才是图片提供方，所以我们后面会看看ImageProvider究竟是要做点什么的。 其他的参数是一些图片的属性和一些builder。</p>
<h1 id="imagestate">ImageState</h1>
<p>关键代码：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">void</span> didUpdateWidget(Image oldWidget) {
    <span style="color:#66d9ef">super</span>.didUpdateWidget(oldWidget);
    <span style="color:#66d9ef">if</span> (_isListeningToStream <span style="color:#f92672">&amp;&amp;</span>
        (widget.loadingBuilder <span style="color:#f92672">==</span> <span style="color:#66d9ef">null</span>) <span style="color:#f92672">!=</span> (oldWidget.loadingBuilder <span style="color:#f92672">==</span> <span style="color:#66d9ef">null</span>)) {
      _imageStream.removeListener(_getListener(oldWidget.loadingBuilder));
      _imageStream.addListener(_getListener());
    }
    <span style="color:#66d9ef">if</span> (widget.image <span style="color:#f92672">!=</span> oldWidget.image)
      _resolveImage();
  }
</code></pre></div><h1 id="imageprovider">ImageProvider</h1>
<p>其实ImageProvider是一个抽象类，让需要定制的子类去做一些实现。</p>
<p>比如：FileImage、MemoryImage、ExactAssetImage等等。其中对FileImage的代码进行了一些分析。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#66d9ef">class</span> <span style="color:#a6e22e">FileImage</span> <span style="color:#66d9ef">extends</span> ImageProvider<span style="color:#f92672">&lt;</span>FileImage<span style="color:#f92672">&gt;</span> {
  <span style="color:#75715e">/// Creates an object that decodes a [File] as an image.
</span><span style="color:#75715e"></span>  <span style="color:#75715e">///
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// The arguments must not be null.
</span><span style="color:#75715e"></span>  <span style="color:#66d9ef">const</span> FileImage(<span style="color:#66d9ef">this</span>.file, { <span style="color:#66d9ef">this</span>.scale: <span style="color:#ae81ff">1.0</span> })
      <span style="color:#f92672">:</span> <span style="color:#66d9ef">assert</span>(file <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span>),
        <span style="color:#66d9ef">assert</span>(scale <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span>);
 
  <span style="color:#75715e">/// The file to decode into an image.
</span><span style="color:#75715e"></span>  <span style="color:#66d9ef">final</span> File file;
 
  <span style="color:#75715e">/// The scale to place in the [ImageInfo] object of the image.
</span><span style="color:#75715e"></span>  <span style="color:#66d9ef">final</span> <span style="color:#66d9ef">double</span> scale;
 
  <span style="color:#960050;background-color:#1e0010">@</span>override
  Future<span style="color:#f92672">&lt;</span>FileImage<span style="color:#f92672">&gt;</span> obtainKey(ImageConfiguration configuration) {
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> SynchronousFuture<span style="color:#f92672">&lt;</span>FileImage<span style="color:#f92672">&gt;</span>(<span style="color:#66d9ef">this</span>);
  }
 
  <span style="color:#960050;background-color:#1e0010">@</span>override
  ImageStreamCompleter load(FileImage key) {
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> MultiFrameImageStreamCompleter(
      codec: _loadAsync(key),
      scale: key.scale,
      informationCollector: (StringBuffer information) {
        information.writeln(<span style="color:#e6db74">&#39;Path: </span><span style="color:#e6db74">${</span>file<span style="color:#f92672">?</span>.path<span style="color:#e6db74">}</span><span style="color:#e6db74">&#39;</span>);
      }
    );
  }
 
  Future<span style="color:#f92672">&lt;</span>ui.Codec<span style="color:#f92672">&gt;</span> _loadAsync(FileImage key) <span style="color:#66d9ef">async</span> {
    <span style="color:#66d9ef">assert</span>(key <span style="color:#f92672">==</span> <span style="color:#66d9ef">this</span>);
 
    <span style="color:#66d9ef">final</span> Uint8List bytes <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> file.readAsBytes();
    <span style="color:#66d9ef">if</span> (bytes.lengthInBytes <span style="color:#f92672">==</span> <span style="color:#ae81ff">0</span>)
      <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">null</span>;
 
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">await</span> ui.instantiateImageCodec(bytes);
  }
 
  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">bool</span> <span style="color:#66d9ef">operator</span> <span style="color:#f92672">==</span>(<span style="color:#66d9ef">dynamic</span> other) {
    <span style="color:#66d9ef">if</span> (other.runtimeType <span style="color:#f92672">!=</span> runtimeType)
      <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">false</span>;
    <span style="color:#66d9ef">final</span> FileImage typedOther <span style="color:#f92672">=</span> other;
    <span style="color:#66d9ef">return</span> file<span style="color:#f92672">?</span>.path <span style="color:#f92672">==</span> typedOther.file<span style="color:#f92672">?</span>.path
        <span style="color:#f92672">&amp;&amp;</span> scale <span style="color:#f92672">==</span> typedOther.scale;
  }
 
  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">int</span> <span style="color:#66d9ef">get</span> hashCode <span style="color:#f92672">=&gt;</span> hashValues(file<span style="color:#f92672">?</span>.path, scale);
 
  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">String</span> toString() <span style="color:#f92672">=&gt;</span> <span style="color:#e6db74">&#39;</span><span style="color:#e6db74">$</span>runtimeType<span style="color:#e6db74">(&#34;</span><span style="color:#e6db74">${</span>file<span style="color:#f92672">?</span>.path<span style="color:#e6db74">}</span><span style="color:#e6db74">&#34;, scale: </span><span style="color:#e6db74">$</span>scale<span style="color:#e6db74">)&#39;</span>;
}
</code></pre></div><p>FileImage重写了 obtainKey、load的方法。但是在什么地方会调用这两个重写的方法呢？那肯定是ImageProvider这个父类了。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#960050;background-color:#1e0010">@</span>optionalTypeArgs
<span style="color:#66d9ef">abstract</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">ImageProvider</span><span style="color:#f92672">&lt;</span>T<span style="color:#f92672">&gt;</span> {
  <span style="color:#75715e">/// Abstract const constructor. This constructor enables subclasses to provide
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// const constructors so that they can be used in const expressions.
</span><span style="color:#75715e"></span>  <span style="color:#66d9ef">const</span> ImageProvider();
 
  <span style="color:#75715e">/// Resolves this image provider using the given `configuration`, returning
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// an [ImageStream].
</span><span style="color:#75715e"></span>  <span style="color:#75715e">///
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// This is the public entry-point of the [ImageProvider] class hierarchy.
</span><span style="color:#75715e"></span>  <span style="color:#75715e">///
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// Subclasses should implement [obtainKey] and [load], which are used by this
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// method.
</span><span style="color:#75715e"></span>  ImageStream resolve(ImageConfiguration configuration) {
    <span style="color:#66d9ef">assert</span>(configuration <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span>);
    <span style="color:#66d9ef">final</span> ImageStream stream <span style="color:#f92672">=</span> <span style="color:#66d9ef">new</span> ImageStream();
    T obtainedKey;
    obtainKey(configuration).then<span style="color:#f92672">&lt;</span><span style="color:#66d9ef">void</span><span style="color:#f92672">&gt;</span>((T key) {
      obtainedKey <span style="color:#f92672">=</span> key;
      stream.setCompleter(PaintingBinding.instance.imageCache.putIfAbsent(key, () <span style="color:#f92672">=&gt;</span> load(key)));
    }).catchError(
      (<span style="color:#66d9ef">dynamic</span> exception, StackTrace stack) <span style="color:#66d9ef">async</span> {
        FlutterError.reportError(<span style="color:#66d9ef">new</span> FlutterErrorDetails(
          exception: exception,
          stack: stack,
          <span style="color:#66d9ef">library</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;services library&#39;</span>,
          context: <span style="color:#e6db74">&#39;while resolving an image&#39;</span>,
          silent: <span style="color:#66d9ef">true</span>, <span style="color:#75715e">// could be a network error or whatnot
</span><span style="color:#75715e"></span>          informationCollector: (StringBuffer information) {
            information.writeln(<span style="color:#e6db74">&#39;Image provider: </span><span style="color:#e6db74">$</span>this<span style="color:#e6db74">&#39;</span>);
            information.writeln(<span style="color:#e6db74">&#39;Image configuration: </span><span style="color:#e6db74">$</span>configuration<span style="color:#e6db74">&#39;</span>);
            <span style="color:#66d9ef">if</span> (obtainedKey <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span>)
              information.writeln(<span style="color:#e6db74">&#39;Image key: </span><span style="color:#e6db74">$</span>obtainedKey<span style="color:#e6db74">&#39;</span>);
          }
        ));
        <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">null</span>;
      }
    );
    <span style="color:#66d9ef">return</span> stream;
  }
 
  <span style="color:#75715e">/// Converts an ImageProvider&#39;s settings plus an ImageConfiguration to a key
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// that describes the precise image to load.
</span><span style="color:#75715e"></span>  <span style="color:#75715e">///
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// The type of the key is determined by the subclass. It is a value that
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// unambiguously identifies the image (_including its scale_) that the [load]
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// method will fetch. Different [ImageProvider]s given the same constructor
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// arguments and [ImageConfiguration] objects should return keys that are
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// &#39;==&#39; to each other (possibly by using a class for the key that itself
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// implements [==]).
</span><span style="color:#75715e"></span>  <span style="color:#960050;background-color:#1e0010">@</span>protected
  Future<span style="color:#f92672">&lt;</span>T<span style="color:#f92672">&gt;</span> obtainKey(ImageConfiguration configuration);
 
  <span style="color:#75715e">/// Converts a key into an [ImageStreamCompleter], and begins fetching the
</span><span style="color:#75715e"></span>  <span style="color:#75715e">/// image.
</span><span style="color:#75715e"></span>  <span style="color:#960050;background-color:#1e0010">@</span>protected
  ImageStreamCompleter load(T key);
 
  <span style="color:#960050;background-color:#1e0010">@</span>override
  <span style="color:#66d9ef">String</span> toString() <span style="color:#f92672">=&gt;</span> <span style="color:#e6db74">&#39;</span><span style="color:#e6db74">$</span>runtimeType<span style="color:#e6db74">()&#39;</span>;
}
</code></pre></div><p>该方法的作用就是创建一个ImageStream，并且ImageConfiguration作为key从ImageCache中获取ImageCompleter，设置到ImageStream上面。而ImageCompleter是为了设置一些回调和帮助ImageStream设置图片的一个类。</p>
<p>ImageConfiguration是对于ImageCompleter的一些配置。</p>
<p>ImageCache是对于ImageCompleter的缓存。 ImageStreamCompleter putIfAbsent(Object key, ImageStreamCompleter loader(), { ImageErrorListener onError }) 这个方法在resolve方法中是一个关键方法。</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">ImageStreamCompleter putIfAbsentImageStreamCompleter putIfAbsent(<span style="color:#66d9ef">Object</span> key, ImageStreamCompleter loader()) {
    <span style="color:#66d9ef">assert</span>(key <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span>);
    <span style="color:#66d9ef">assert</span>(loader <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span>);
    ImageStreamCompleter result <span style="color:#f92672">=</span> _cache[key];
    <span style="color:#66d9ef">if</span> (result <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span>) {
      <span style="color:#75715e">// Remove the provider from the list so that we can put it back in below
</span><span style="color:#75715e"></span>      <span style="color:#75715e">// and thus move it to the end of the list.
</span><span style="color:#75715e"></span>      _cache.remove(key);
    } <span style="color:#66d9ef">else</span> {
      <span style="color:#66d9ef">if</span> (_cache.length <span style="color:#f92672">==</span> maximumSize <span style="color:#f92672">&amp;&amp;</span> maximumSize <span style="color:#f92672">&gt;</span> <span style="color:#ae81ff">0</span>)
        _cache.remove(_cache.keys.first);
      result <span style="color:#f92672">=</span> loader();
    }
    <span style="color:#66d9ef">if</span> (maximumSize <span style="color:#f92672">&gt;</span> <span style="color:#ae81ff">0</span>) {
      <span style="color:#66d9ef">assert</span>(_cache.length <span style="color:#f92672">&lt;</span> maximumSize);
      _cache[key] <span style="color:#f92672">=</span> result;
    }
    <span style="color:#66d9ef">assert</span>(_cache.length <span style="color:#f92672">&lt;=</span> maximumSize);
    <span style="color:#66d9ef">return</span> result;
 }
</code></pre></div><p>这个方法是在imageCache里面的，提供的是内存缓存api的入口方法，putIfAbsent会先通过key获取之前的ImageStreamCompleter对象，这个key就是NetworkImage对象，当然我们也可以重写obtainKey方法自定义key，如果存在则直接返回，如果不存在则执行load方法加载ImageStreamCompleter对象，并将其放到首位(最少最近使用算法)。 也就是说ImageProvider已经实现了内存缓存：默认缓存图片的最大个数是1000，默认缓存图片的最大空间是10MiB。 第一次加载图片肯定是没有缓存的，所以会调用loader方法，那就是方法外面传进去的load()方法。</p>
<p>FileImage的load方法</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart"><span style="color:#960050;background-color:#1e0010">@</span>override
ImageStreamCompleter load(FileImage key) {
  <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">new</span> MultiFrameImageStreamCompleter(
    codec: _loadAsync(key),
    scale: key.scale,
    informationCollector: (StringBuffer information) {
      information.writeln(<span style="color:#e6db74">&#39;Path: </span><span style="color:#e6db74">${</span>file<span style="color:#f92672">?</span>.path<span style="color:#e6db74">}</span><span style="color:#e6db74">&#39;</span>);
    }
  );
}
 
Future<span style="color:#f92672">&lt;</span>ui.Codec<span style="color:#f92672">&gt;</span> _loadAsync(FileImage key) <span style="color:#66d9ef">async</span> {
  <span style="color:#66d9ef">assert</span>(key <span style="color:#f92672">==</span> <span style="color:#66d9ef">this</span>);
 
  <span style="color:#66d9ef">final</span> Uint8List bytes <span style="color:#f92672">=</span> <span style="color:#66d9ef">await</span> file.readAsBytes();
  <span style="color:#66d9ef">if</span> (bytes.lengthInBytes <span style="color:#f92672">==</span> <span style="color:#ae81ff">0</span>)
    <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">null</span>;
 
  <span style="color:#66d9ef">return</span> <span style="color:#66d9ef">await</span> ui.instantiateImageCodec(bytes);
}
</code></pre></div><p>load方法中使用了一个叫MultiFrameImageStreamCompleter的类：</p>
<div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-dart" data-lang="dart">MultiFrameImageStreamCompleter({
  <span style="color:#960050;background-color:#1e0010">@</span>required Future<span style="color:#f92672">&lt;</span>ui.Codec<span style="color:#f92672">&gt;</span> codec,
  <span style="color:#960050;background-color:#1e0010">@</span>required <span style="color:#66d9ef">double</span> scale,
  InformationCollector informationCollector
}) <span style="color:#f92672">:</span> <span style="color:#66d9ef">assert</span>(codec <span style="color:#f92672">!=</span> <span style="color:#66d9ef">null</span>),
     _informationCollector <span style="color:#f92672">=</span> informationCollector,
     _scale <span style="color:#f92672">=</span> scale,
     _framesEmitted <span style="color:#f92672">=</span> <span style="color:#ae81ff">0</span>,
     _timer <span style="color:#f92672">=</span> <span style="color:#66d9ef">null</span> {
  codec.then<span style="color:#f92672">&lt;</span><span style="color:#66d9ef">void</span><span style="color:#f92672">&gt;</span>(_handleCodecReady, onError: (<span style="color:#66d9ef">dynamic</span> error, StackTrace stack) {
    FlutterError.reportError(<span style="color:#66d9ef">new</span> FlutterErrorDetails(
      exception: error,
      stack: stack,
      <span style="color:#66d9ef">library</span><span style="color:#f92672">:</span> <span style="color:#e6db74">&#39;services&#39;</span>,
      context: <span style="color:#e6db74">&#39;resolving an image codec&#39;</span>,
      informationCollector: informationCollector,
      silent: <span style="color:#66d9ef">true</span>,
    ));
  });
}
</code></pre></div><p>MultiFrameImageStreamCompleter是ImageStreamCompleter的子类，为了处理多帧的图片加载，Flutter的Image支持加载webp，通过MultiFrameImageStreamCompleter可以对webp文件进行解析，MultiFrameImageStreamCompleter拿到外面传入的codec数据对象,通过<strong>handleCodecReady</strong>来保存Codec，之后调用<strong>decodeNextFrameAndSchedule</strong>方法，从Codec获取下一帧图片数据和把数据通知回调到Image，并且开启定时解析下一帧图片数据。</p>
<p>到此为止，基本dart流程就走完了，所以需要做stopAnimation和startAnimation的改造就应该这这个MultiFrameImageStreamCompleter入手了。</p>
<h1 id="最后">最后</h1>
<p>整个在Dart层面Image解析webp的流程就这样，</p>
        </div>

        
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        <li style="word-break:break-all"><strong>原文链接：</strong><a href="https://luckly.work/post/flutter_widget/%E6%8E%A2%E7%B4%A2Flutter_Image%E6%98%BE%E7%A4%BAWebp%E9%80%BB%E8%BE%91/">https://luckly.work/post/flutter_widget/%E6%8E%A2%E7%B4%A2Flutter_Image%E6%98%BE%E7%A4%BAWebp%E9%80%BB%E8%BE%91/</a></li>
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